openstack-ansible/doc/source/install-guide/app-tips.rst

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Appendix D. Tips and Tricks

Ansible Forks

The default MaxSessions setting for the OpenSSH Daemon is 10. Each Ansible fork makes use of a Session. By default Ansible sets the number of forks to 5, but a deployer may wish to increase the number of forks used in order to improve deployment performance in large environments.

This may be done on a permanent basis by adding the forks configuration entry in ansible.cfg, or for a particular playbook execution by using the --forks CLI parameter. For example, to execute the os-keystone-install.yml playbook using 10 forks:

openstack-ansible --forks 10 os-keystone-install.yml

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